[O.B.Left]

But release motions need to occur on the same delivery line or else the clubhead orbit becomes 3 dimensional. So, those with Hand paths not matching the Clubshaft plane or vice-a-versa, will need some mechanism to arrive at impact without bending the delivery line.

Where does Homer mention that the Hand Path (Delivery Path) must match the Clubshaft Plane? Assuming one is using the TSP the Hands and the clubshaft travel this plane for instance no? If you are tracing.

While he recommends using a bench or rail for demonstrative purposes he doesnt preclude a plane shift during Release.

4-D-0 RELEASE MOTIONS This term refers to the Release of Accumulators #2 during either half of the Release Motion. etc

It is mandatory that there is no break or bend in the Delivery Line direction during either half of the Release Motion. Both halves, as well as, the Release and Finish Roll (2-G), must be executed on the same Delivery Line (2-J-3) – On Line or Cross Line, but not both. Construct an Inclined Plane such as shown in 10-5, or find a low bench, fence rail – or anything providing the Clubshaft with a straight edge or flat surface – and swing the Clubshaft back and forth along that edge or surface while executing the above Wrist and Hand Motions until you thoroughly understand their relation to 10-5. Study 2-N very carefully. That is why item 12-3-22 is capitalized. Study 3-F-6.

Remember a flat plane has a straight baseline. A circle is two dimensional and can lie on a flat plane. If the Plane Line loses it straightness the Clubhead Orbit becomes three dimensional and precision vanishes.

Ben Doyle has suggested that the Plane might be concave. I haven't found much to support that but I find lots of ways golfers get-around the problem.

OK I think I get you, now. The geometry is tuff. I have it on good authority that you can with great effort seek to understand it or you can merely trace a straight line Base Line and you'll be ok. A concave plane is not a plane, not a flat plane and therefore wouldnt have a straight line base line. So in fact youd be tracing a new base line or lines and by definition you'd have a bent plane line.

The geometry is confusing but for a flat plane ,that shifts angles, the straight line base line stays the same, the club rides the plane with one end or the other pointing at the base line BUT ASSUMING A SHIFT THE HAND PATH, DELIVERY PATH IS NOT A STRAIGHT LINE. See 10-23-B, C and D. Each photo of Dianne in 10-23-B #1, 2, 3 has her club pointed at the straight line base line. Her Hand Path running down plane, her club following and doing likewise.

That's a problem that anyone with a downstroke plane shift must resolve (Hand paths not matching the Clubshaft plane). "Plane Shifts are Hazardous".

Shifting your weight is hazardous. Going to End instead of Top is hazardous. Homer used that Hazardous sentence in connection with choosing a Plane Angle higher than the TSP, it requiring a shift back to the TSP before Startdown. That is hazardous, but still good enough to win many a major championship.

But anyone with Hand paths matching the Clubshaft plane can use a Flat Left Wrist Throughout the Stroke and a TSP offers that and more.

You're going to have send a diagram on what this relationship means to you. Where is this in the book? What do you mean by clubshaft plane here? Look at Dianne in those photos, her hands and her clubshaft are traveling the same plane angles as she shifts. Elbow, TSP, Elbow, Triple Shift, 10-23-B Angled Line.

Shift'n isnt a bad thing. Not at all.